Mitsubishi Electric MELSEC-A Series Manual page 180

5
REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
3) Performance comparison of AJ72LR25/AJ72QLR25/A1SJ72QLR25 and QJ72BR15
Item
LX/LY 8192 points
Maximum number
of link points per LB 8192 points
network
LW 8192 points
<Remote master station  remote I/O station>
Maximum number of link {(LY + LB) 8 + (2 × LW)}
points per station
<Remote I/O station  remote master station>
{(LY + LB) 8 + (2 × LW)}
Maximum number of I/O
X + Y
points per remote I/O station
Communication speed 10Mbps
Communication method Token ring method
Synchronous type Frame synchronization method
Encoding method Manchester code
Transmission method Duplex loop
Transmission format HDLC standards (frame format)
255 (Total number of
Maximum number of PLC to PLC networks
networks and remote I/O
networks)
65 stations (Remote master station: 1, remote
Number of stations connected
in one network
I/O station: 64)
Applicable cable 3C-2V, 5C-2V, 5C-FB
3C-2V: 19.2km
Overall distance
5C-2V, 5C-FB: 30km
3C-2V: 300m
Distance between stations
5C-2V, 5C-FB: 500m
Error control system
CRC(X
• Loop-back function due to error detection or
broken cable
• Diagnostic function for checking local link
lines
RAS function
• Abnormal detection using link special relays
and link special registers
• Network monitoring and various diagnostic
functions
• Monitor, program up/download with
Transient transmission peripheral device
• Dedicated link instruction
Remote master station  remote sub-master station, remote I/O station: 8192 points
*1
Remote sub-master station, remote I/O station  remote master station: 8192 points
*2 The remote master station includes the multiplexed remote master station and multiplexed remote sub-master station.
*3 When the X/Y numbers are duplicate, one side only is taken into consideration.
*4 For the A1SJ72QLP25, the maximum number of I/O points per remote I/O station is "X + Y
*5 For the multiplexed remote I/O network, one station in 64 stations of the remote I/O station is used for the multiplexed
remote sub-master station.
*6 For the multiplexed remote I/O network, one station in 32 stations of the remote I/O station is used for the multiplexed
remote sub-master station.
5
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Specifications
AJ72QLR25
AJ72LR25
A1SJ72QLR25
1600 bytes
1600 bytes
2048 points X + Y 2048 points
239 (Total number of PLC to PLC networks and
remote I/O networks)
*5
16 12 5
+ X + X + 1) and retry by a time over
: Compatible,
Compatibility
QJ72BR15
*1
16384 points
*1
16384 points
*2
*2
*4 *3
X + Y 4096 points
Token bus method
Single bus
33 stations (Remote master
station: 1, remote I/O station:
*6
32)
3C-2V: 300m
5C-2V, 5C-FB: 500m
• Diagnostic function for
checking local link lines
• Abnormal detection using
link special relays and link
special registers
• Network monitoring and
various diagnostic
functions
• 1:1 communication
(Monitor, program up/
download)
• Dedicated link instruction
: Partial change required, × : Incompatible
Precautions for replacement
Nothing to be noted though the
communication method differs.
The loopback function and
multiplex transmission function
cannot be used on a coaxial bus
system. To use the functions,
using an optical loop system is
recommended.
Network No.240 to No.250 cannot
be set. Alternate them with
unused network No.
Remote I/O stations up to 32
stations can be used on a coaxial
bus system. To use 33 remote I/O
stations or more, using an optical
loop system is recommended.
Either use an A6BR10/A6BR10-
DC type repeater unit, or use an
optical loop system.
The loopback function cannot be
used on a coaxial bus system. To
use the loopback function, using
an optical loop system is
recommended.
For comparison of dedicated link
instruction, refer to Section 5.1.7.
1024 points".